[Bug 1933711] Re: defining tmpfs /tmp in autoinstall config fails

[Michael Hudson-Doyle]

So https://github.com/canonical/subiquity/pull/993 should fix this. I've
built this PR into a snap and pushed it to the edge/pr-993 channel so if
you add this to your autoinstall.yaml:

refresh-installer:
   update: yes
   channel: "edge/pr-993"

it should work now. (If your install is offline, you should be able to
use https://github.com/mwhudson/livefs-editor to stuff the new snap into
an ISO).

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https://bugs.launchpad.net/bugs/1933711

Title:
  defining tmpfs /tmp in autoinstall config fails

Status in subiquity package in Ubuntu:
  Triaged

Bug description:
  Attempting to creat a tmpfs /tmp partition with the Ubuntu 20.04
  autoinstaller fails with the error: __init__() missing 1 required
  positional argument: 'device'

  The relevant section of the user-data file I'm attempting is:
      - id: tmpfs1
        type: mount
        spec: "none"
        path: "/tmp"
        options: size=4194304
        fstype: "tmpfs"

  This section is copied directly from https://curtin.readthedocs.io/en/latest/topics/storage.html (changing the path).  
  The full file is attached.

  Autoinstall succeeds if all of the lines listed above are deleted.

  I'm using the daily ISO autoinstall image downloaded using the script
  at https://github.com/covertsh/ubuntu-autoinstall-generator .

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